Continuous-heating furnace.



ATENTED MAR. 13, 19923. W. R. MILLER.

INVENTDR 2 SHEETS-SHEET 2v AT'ronNzYs No. 815,198. PATENTED MAR. 13, 1906. W. R. MILLER.

CONTINUOUS HEATING FURNACE.

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UNITED STATES PATENT OFFICE,`

WILLIAM it. MILLER, OF PlTTSBURG. PENNSYLVANIA, ASSIGNOR TO FORTER-MILLER ENGlNEERlblG COMPANY, OF PITTSBURG, PENN- SYLVANlA, A GORPORA"1ON GF PENNSYLVANIA.

coNTiNuous-Hsarme FURNACE.

Speeeation of Letters Patent.

Patented March 13. 1906.

Application filed December 2, QIL Serial No. 238,360.

citizen of the United States of florence,V :re-f; of Alle? siding at Pittsburg, in the county glieny and State of Pennsylvania, have invented or discovered new and useful Iniproveinents in Continuous-Heating Furnaces of which the following is a specification.

My invention relates to continuous-heating furnaces designed especially for billets amill the like, but adapted fpr other articles as we It is the object of my invention to provide a furnace which will heat the line of traveling billets on both their upper and lower surfaces and prevent the cinder which drips from the billets from clogging up the heat-passage helow the billets or the gasorts or the grates of the furnace. In some rnaees the cinder or slagruns down over the as-ports which enter the furnace below the 'unisce-bottom,

Vand consequently interferes with the burning of the gases and clogs its entrance to the furnace. In other furnaces the cinder harde-ns beneath the billets to such an extent as to close entirely the heating-space there. This is due to having the furnace-bottom incorrectly constructed or to the using of billettrack supports which occupy this space to such an extent as to prevent the maintenance of the cinder in a molten condition or to the placing of coolin -pipes on the'fnrnace-bottoni or at such p aces as to chill the cinder beyond the capacity of the urnacerto Keep it melted or to other faulty engineering ractice. By my invention I Vprovide a' arge l heatin' space or chamber beneath the billets and u 'eh will maintain the cinder in a molten state. l do not obstruct this chamber by piers of masonry or by pipes so ar ranged as to catch and chill the cinder. provide for the escape of the cinder without permitti it to clog the grate or the gassupply. also provide a construction which causes the beat to be distributed properly to the s aces above and below the billets.

Ot er objects of my invention will appear in the detailed descri tion thereof.`

Referring to the rawings, Fionre 1 is a longitudinal section of one form o? my invention where I ern loy a. grate. Fig. 2 is a horizontal section t ou h the heating-chamber above the billet-trani;

Fig. 3, a vertical see tion on the line 3 3 of Fig. 1 looking along the Yarrows at said line; Fig. 4, a view similar to Fig. 1 of a modified form of my invention wherein the furnace is heated bv gas; Figs. 5, 6, and 7, vertical sections on the lines 5 5, 6 6, and 7 res ectively, of Fig. 4,1ooking in the direction o the arrows adlaeent to said lines; Fig. S, a vertical section of. one of the billet-track supports; Fi 9, an enlarged view ofthe upper part of h ig. 8, and Fig 10 a horizontal section on the line 10 1Q of igi 9 looking along the arrows at said line.'

Referring to Figs. 1, 2, 3, 8, 9, and 1i), m furnace preferably has its bed or floor Wit the long front slope 1 and the short rear slope 2, lone or more cinder notches or openings 3 bci made throu b the sides of the furnace at t e junction o the two slopes, throu h which the cinder or slag dripping from the billets may escape. In the recess 4, at the rear end of the furnace, I locate the grate 5, the recess opening upwardly and cornmuneating with horizontal passage 6, which runs to the front of the furnace and connects with the outletl tn the stack. (Not shown.) Extending frorn the front of the furnace toward the rear thereof are the hollowbilletPsup erts S, which constitute a track along which the billets 9 are pushed from the opening 10. The supports 8 have their rear portions inclined, as shown at 11, down winch the billets slide upon the portion 2 of the furnace-botwall 12, over which the flame passes from t e recess or chamber 4 to the chamber 6. In the sides of the furnace opposite the ends of the billet 9, which lies at the loot of the incline 1 1, are openings 13 for pushing the billet endwise out of the furnace. The billet-supports are heid from bending or sagging by the vertical supports 14, which are ollow and have a partition 15 therein, which extends from the bottom nearly to the top, whereby a Watereourse therein is established u one pas sage 16 above the partition 15 an down the passage 1?. The passages 16 in the several supports 14 are fed from the branch pipes 18, connected to a common feeder-pipe 19. The passages 17 are connected to the branch pipes 20, leading to the common outlet-'pipe 21. The supports 1a are provided with caps or shields 22, corn osed of any refractory material, as fire-brielir, or of iron or other metallic torn a short distance in front of the brid e-V IOO substance, having sockets in their under sides fitting over the up )cr ends of the said suports. The tops o the shields have grooves 1n which the supports 8 rest and arc but little larger than the supports. From the tops the shields have their sides diverge beyond the supports 14, so as to lead the dripping cinder away from said supports to prevent it from adhering thereto and narrowing the heatingchamber. 'Ihe supports 14 may be used to support the whole length of the supports 8; but as the cinder does not drop until the billets are some distance toward the rear I provide piers or supports 23, of masonry or the like, at the front end. Opposite the supports 14 I place openings 24, through which the supports 14 may be seen and cared for, il necessary.

The supports S are well above the furnacefioor, so as to give the heat free access to the under side of the billets, and the rear end of the supports 8 are at such a height in the passage 6 that the fiame and heat which travel toward it divides, so as to properly heat all the exposed parts of the billets. The supports are not carried through the sides of the furnace, but pass through the furnace-Hoor,

beneath which they are connected to the branch pipes 18 and 20, as aforesaid. By this construction the cooling effect of the water in the supports and pipes is removed from the cinder which falls on the furnacefioor. I have no horizontal pipes on or near the said Hoor on which the cinder can fall and become chilled, thereby clogging thc furnace. The best construction requires all the water circulation within the chamber to be in the planes of the supports or rails 8, as they will then bc less liable to be engaged by the cinder.

The billets are charged in at the opening 1() and shoved along in a manner well known in the art toward the rear of the furnace. When the billets reach the discharge-openings 13, they are discharged endwise by any sultable means, also well known in the art. It will be noted that the incline 3 of the furnace-bottom extends rearwardly to the vi cinity of the billet-discharge opening 13, so that the cinder which drips from the billet ulpl to the time of its discharge will run down t 's incline.

Figs. 4 to 7 do not differ from Figs. 1 to 3 except in the heating means. In Figs. 4 to 7 the passage 6 communicates rearwardly with the air and gas ports 25 and 26, which are inclined so as to direct the flame into the chambers above and below the billets.

In my invention the cinder cannot run into or over the gas and air ports nor into the firebox, but is directed to another place and drawn oil. The cinder will be ke t melted on the furnace-floor, as the heat las ample space and freedom to seek out all the cinder. The shields will keep the cinder away from the vertical supports 14; but the flame would not in any case permit it to gather to any injurious extent.

Many changes may be made in my invention both in the elements selected or devised and the combinations of the same. I do not, therefore, desire to be restricted to the precise elements or combination shown, but desire a liberal interpretation of my claims, so that they shall include everything within the spirit thereof.

Having described my invention, I claim- 1. In a continuous-heating furnace, a hollow track, hollow supports therefor extending throu h the floor of the furnace below the furnace-c iamber, and means for leading a cooling fiuid to and from said supports.

2. In a continuous-heating furnace, a hollow track, and vertical supports in pairs beneath the same having a fluid circulation therethrough, the members of the pairs extending through the furnace-bottom.

3. In a continuous-heating furnace, a hollow track, and supports beneath the same, having means for conductin a cooling fluid to and from the upper end t iereof, said supports passing through the floor of the furnace.

4. In a continuous-heating furnace, a hollow track, hollow supports therefor havin their axes in the vertical plane including sai track, and means for supplying a cooling fluid to the hollows of said supports.

`5. In a continuous-heating furnace, a hollow track, supports therefor, havin means for leading a cooling fiuid wholly in the vertical plane including said track.

6. In a continuous-heating furnace for billets, a hollow track, hollow fluid-cooled supports for the same, and shields on the supports extending laterally beyond the latter.

7. In a continuous-heating furnace for billets, a track, supports therefor having a fluid circulation therethrough shields on the supports consisting of a track-supporting portion and portions diverging downwardly therefrom.

Signed at Pittsburg, Pennsylvania, this 19th day of December, A. D. 1904.

WILLIAM R. MILLER.

Ii tnesses F. N. BARBER, A. M. STEEN.

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